Welcome to the SIR Model Tutorial!
Let’s explore how we can use this model to simulate the spread of a pathogen in a small population.
Select the button to begin.
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Congratulations!
You’ve reached the end of this tutorial! Select “Start Outbreak Simulator” to try a full simulation. Or you can .
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Simulation Board
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Simulator Status
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Susceptible
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Susceptible
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Susceptible
and Close Contact -
Susceptible
and Close Contact (highlighted)
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Infectious
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Newly
Infectious -
Infectious
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Removed
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Newly
Recovered -
Recovered
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Vaccinated
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Susceptible
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Susceptible
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Susceptible
and Close Contact -
Susceptible
and Close Contact (highlighted)
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Infectious
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Newly
Infectious -
Infectious
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Removed
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Newly
Recovered -
Recovered
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Vaccinated
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Settings | Day 0
Before you begin the simulation (Day 0), enter numbers between 1 and 100 as the initial Transmission Probability and initial Recovery Probability.
You can change these two probabilities at the beginning of each day in the simulation.
Transmission and Recovery Probabilities
Set Initial Case
- Select an individual in the population grid as the first infectious case in this population.
- Select the “Set Initial Case” button that appears.
- To change the initial case, perform the same action on a different individual.
Simulate each day by following these steps:
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For each infectious individual in the population grid, select their icon, then “Simulate New Infections.” Select “Done” when finished with all infectious individuals.
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Optionally, select one susceptible individual to vaccinate, then select “Done.” Or select “Skip.”
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Reveal the number of recovered individuals by selecting “Simulate New Recoveries.”
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Copy the numbers of infectious and removed individuals into the “SIR Data Table,” or turn on “Autofill” to automatically fill in the table. Select “End Day” to proceed.: off on
Current Day's Data
Current Day's Data, Infectious: 0Current Day's Data, Removed: 0
SIR Data Table
Day | Current Day 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 |
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Susceptible | 36 | |||||||||||||||||||||||||
Infectious | ||||||||||||||||||||||||||
Removed |
SIR Graph
This graph shows changes in the number of individuals in each group (susceptible, infectious, and removed) over time. Listen to the Graph